Question

Unsaved Find the surface area of a conical grain storage tank that has a height of 46 meters and a diameter of 16 meters. Round the answer to the nearest square meter.

Answer 1

The formula for the surface area of a cone is $SA= \pi r(r+ \sqrt{h^2+r^2} )$.  Filling in accordingly, we have $SA= \pi (8)(8+ \sqrt{46^2+8^2} )$ and $SA=8 \pi (8+ \sqrt{2116+64})$.  That will simplify to $SA=8 \pi (8+ \sqrt{2180} )$ and $SA=8 \pi (8+46.69047)$.  If we LEAVE pi in the answer you would have $437.5 \pi$ which rounds to $438 \pi$.  If you multiply pi in, you would have 1375.5 or, rounded, 1376.  Of course those labels are all meters squared.